I guess Bernie just won a useless online poll.

[Gore1FL]

126. The Democracy for America endorsement was awarded to Sanders.

This was based on, among other things, a vote of it's membership. If DU had a vote that resulted in an endorsement, would you complain that there were DUers with duplicate accounts? Let's take a look at the Democracy for America endorsement process using a neat little tool, I call "Google":

"The driving force behind all DFA endorsements is our membership. We gauge DFA member support in a number of different ways. For starters, supporters can publicly show their support on any candidate’s application page. We also utilize endorsement decisions of local DFA groups as a measure of local community support. "

http://www.democracyforamerica.com/about_endorsements

Now, you can make the argument that the voters are not a good population relative to the American voting public if you'd like that would be valid. But I don't think validity is your concern. Otherwise, you wouldn't be making unrelated arguments about something you haven't even bother to understand. You simply are posting to be contrary. It's a strange practice, and almost as attractive as your grave dancing.